TY  - JOUR
AU  - E. D. Garber
TI  - Periodic solutions of certain non-linear differential equations
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 1003
EP  - 1006
VL  - 172
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_172_5_a2/
LA  - ru
ID  - DAN_1967_172_5_a2
ER  -